Strategy: Tomb Raider game fans love nothing more than to solve a challenge, and the more difficult it is, the sweeter the reward. We needed to create the world's hardest email.

Execution: We invented technology to turn our email into an interactive adventure It began with a secret door that slid open to reveal a mysterious map, which directed fans to the legal portion of the email to drive to a microsite where they had to solve yet one more puzzle.

Results: Only an elite 0.1% of gamers solved the puzzle, but that meant it worked; we achieved the world’s hardest email that only the most Lara Croft-inspired gamers could solve – and we know they talked about it – as Social media erupted with tens of thousands of Tomb Raider fans trying to solve the puzzle, generating goal-busting sales. The site also achieved a 61.1% higher CTOR than average.